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National Instruments Corp.
5
NI 9207E Operating Instructions and Specifications
Each voltage channel has an AI+ pin and an AI– pin to which you
can connect a voltage signal. Each current channel has an AI pin to
which you can connect a current signal. The NI 9207E also has
nine V
sup
pins, one for connecting an external power supply, and
one for each current channel. There are also four common pins,
COM, that are internally connected to the isolated ground
reference of the module.
The input signals are scanned, amplified, conditioned, and then
sampled by a single 24-bit ADC. The module provides overvoltage
protection for each channel. Only one channel can be in an
overvoltage condition at a time. Refer to the
section
for information about overvoltage protection. Refer to Figure 3 for
an illustration of the input circuitry on the NI 9207E.